// 云函数入口文件
const cloud = require('wx-server-sdk')

cloud.init()
const db = cloud.database()

// 云函数入口函数
exports.main = async (event, context) => {
  try {
    return await db.collection('books')
      .orderBy('count', 'desc')
      .limit(9)
      .field({
        image: true,
        _id: true,
        count: true,
        title: true
      })
      .get()

  } catch (err) {
    console.error(err)
  }
}